Acetyl chloride → 6-(2,4-Dichlorophenyl)-2-oxo-5-hexene-4-yl Acetate

Participants

Reaction Conditions

Reaction Steps

Acetyl chloride (1.2 ml, 16.5 mmole) was added dropwise to a stirred solution of 6-(2,4-dichlorophenyl)-4-hydroxy-5-hexene-2-one (3.9 g, 15 mmole) in pyridine (60 ml) at 0° C. The ice bath was removed, and the reaction mixture was stirred at 20° C. for 2 hours and then diluted with ether (300 ml). The ether solution was washed with 1 N HCl (3×300 ml) and saturated NaHCO3, dried over MgSO4, filtered and evaporated. The residual pale amber oil (4.1 g) was chromatographed on a 50 mm column with 15 cm of silica gel (230-400 mesh). Elution with methylene chloride (2 L) provided the title compound as a pale yellow oil (3.95 g, 87%): pmr (CDCl3) δ2.03 (3H, s), 2.17 (3H, s), 2.83 (2H, dd).

Provenance & Evidence